Example usage for io.netty.buffer ByteBuf readDoubleLE

Introduction

In this page you can find the example usage for io.netty.buffer ByteBuf readDoubleLE.

Prototype

public double readDoubleLE() 

Source Link

Document

Gets a 64-bit floating point number at the current readerIndex in Little Endian Byte Order and increases the readerIndex by 8 in this buffer.

Usage

From source file:org.traccar.protocol.RetranslatorProtocolDecoder.java

License:Apache License

@Override
protected Object decode(Channel channel, SocketAddress remoteAddress, Object msg) throws Exception {

    if (channel != null) {
        channel.writeAndFlush(new NetworkMessage(Unpooled.wrappedBuffer(new byte[] { 0x11 }), remoteAddress));
    }/*from  w  ww.j a v a2  s .c  om*/

    ByteBuf buf = (ByteBuf) msg;

    buf.readUnsignedInt(); // length

    int idLength = buf.indexOf(buf.readerIndex(), buf.writerIndex(), (byte) 0x00) - buf.readerIndex();
    String id = buf.readBytes(idLength).toString(StandardCharsets.US_ASCII);
    buf.readByte();
    DeviceSession deviceSession = getDeviceSession(channel, remoteAddress, id);
    if (deviceSession == null) {
        return null;
    }

    Position position = new Position(getProtocolName());
    position.setDeviceId(deviceSession.getDeviceId());
    position.setTime(new Date(buf.readUnsignedInt() * 1000));

    buf.readUnsignedInt(); // bit flags

    while (buf.isReadable()) {

        buf.readUnsignedShort(); // block type
        int blockEnd = buf.readInt() + buf.readerIndex();
        buf.readUnsignedByte(); // security attribute
        int dataType = buf.readUnsignedByte();

        int nameLength = buf.indexOf(buf.readerIndex(), buf.writerIndex(), (byte) 0x00) - buf.readerIndex();
        String name = buf.readBytes(nameLength).toString(StandardCharsets.US_ASCII);
        buf.readByte();

        if (name.equals("posinfo")) {
            position.setValid(true);
            position.setLongitude(buf.readDoubleLE());
            position.setLatitude(buf.readDoubleLE());
            position.setAltitude(buf.readDoubleLE());
            position.setSpeed(buf.readShort());
            position.setCourse(buf.readShort());
            position.set(Position.KEY_SATELLITES, buf.readByte());
        } else {
            switch (dataType) {
            case 1:
                int len = buf.indexOf(buf.readerIndex(), buf.writerIndex(), (byte) 0x00) - buf.readerIndex();
                position.set(name, buf.readBytes(len).toString(StandardCharsets.US_ASCII));
                buf.readByte();
                break;
            case 3:
                position.set(name, buf.readInt());
                break;
            case 4:
                position.set(name, buf.readDoubleLE());
                break;
            case 5:
                position.set(name, buf.readLong());
                break;
            default:
                break;
            }
        }

        buf.readerIndex(blockEnd);

    }

    if (position.getLatitude() == 0 && position.getLongitude() == 0) {
        getLastLocation(position, position.getDeviceTime());
    }

    return position;
}

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